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Analysis of O-Ring Seal Failure under Static Conditions and Determination of End-of-Lifetime Criterion
Bundesanstalt Mat Forsch & Prufung, D-12200 Berlin, Germany..
Bundesanstalt Mat Forsch & Prufung, D-12200 Berlin, Germany..ORCID iD: 0000-0001-5079-2307
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0003-3049-7225
Bundesanstalt Mat Forsch & Prufung, D-12200 Berlin, Germany..
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2019 (English)In: Polymers, ISSN 2073-4360, E-ISSN 2073-4360, Vol. 11, no 8, article id 1251Article in journal (Refereed) Published
Abstract [en]

Determining a suitable and reliable end-of-lifetime criterion for O-ring seals is an important issue for long-term seal applications. Therefore, seal failure of ethylene propylene diene rubber (EPDM) and hydrogenated nitrile butadiene rubber (HNBR) O-rings aged in the compressed state at 125 degrees C and at 150 degrees C for up to 1.5 years was analyzed and investigated under static conditions, using both non-lubricated and lubricated seals. Changes of the material properties were analyzed with dynamic-mechanical analysis and permeability experiments. Indenter modulus measurements were used to investigate DLO effects. It became clear that O-rings can remain leak-tight under static conditions even when material properties have already degraded considerably, especially when adhesion effects are encountered. As a feasible and reliable end-of-lifetime criterion for O-ring seals under static conditions should include a safety margin for slight dimensional changes, a modified leakage test involving a small and rapid partial decompression of the seal was introduced that enabled determining a more realistic but still conservative end-of-lifetime criterion for an EPDM seal.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 11, no 8, article id 1251
Keywords [en]
EPDM, HNBR, seal failure, leak-tightness, DLO, oxygen permeability, DMA, indenter modulus
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-261040DOI: 10.3390/polym11081251ISI: 000484552900021PubMedID: 31362423OAI: oai:DiVA.org:kth-261040DiVA, id: diva2:1356703
Note

QC 20191002

Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-10-02Bibliographically approved

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Pourmand, PayamHedenqvist, Mikael S.

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